1 /* $NetBSD: sgmapvar.h,v 1.19 2020/09/05 04:11:10 maya Exp $ */ 2 3 /*- 4 * Copyright (c) 1997, 1998, 2001 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, 9 * NASA Ames Research Center. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #ifndef _ALPHA_COMMON_SGMAPVAR_H 34 #define _ALPHA_COMMON_SGMAPVAR_H 35 36 #include <sys/bus.h> 37 #include <sys/vmem.h> 38 39 /* 40 * Bits n:13 of the DMA address are the index of the PTE into 41 * the SGMAP page table. 42 */ 43 #define SGMAP_ADDR_PTEIDX_SHIFT 13 44 45 /* 46 * An Alpha SGMAP's state information. Nothing in the sgmap requires 47 * locking[*], with the exception of the vmem arena, which takes care 48 * of it on its own. 49 * 50 * [*] While the page table is a `global' resource, access to it is 51 * controlled by the arena; once a region has been allocated from 52 * the arena, that region is effectively `locked'. 53 */ 54 struct alpha_sgmap { 55 vmem_t *aps_arena; /* arena to manage sgva space */ 56 void *aps_pt; /* page table */ 57 bus_addr_t aps_ptpa; /* page table physical address */ 58 bus_addr_t aps_sgvabase; /* base of the sgva space */ 59 bus_size_t aps_sgvasize; /* size of the sgva space */ 60 bus_addr_t aps_wbase; /* base of the DMA window */ 61 }; 62 63 extern vaddr_t alpha_sgmap_prefetch_spill_page_va; 64 extern bus_addr_t alpha_sgmap_prefetch_spill_page_pa; 65 66 void alpha_sgmap_init(bus_dma_tag_t, struct alpha_sgmap *, 67 const char *, bus_addr_t, bus_addr_t, bus_size_t, size_t, void *, 68 bus_size_t); 69 70 int alpha_sgmap_dmamap_create(bus_dma_tag_t, bus_size_t, int, 71 bus_size_t, bus_size_t, int, bus_dmamap_t *); 72 void alpha_sgmap_dmamap_destroy(bus_dma_tag_t, bus_dmamap_t); 73 74 #endif /* _ALPHA_COMMON_SGMAPVAR_H */ 75